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In the United States, 15-20% is standard for sit-down restaurants. 15% for adequate service, 18% for good service, and 20% or more for excellent service. Other countries have different customs.
Traditionally, tips are calculated on the pre-tax subtotal. However, many people tip on the total including tax for simplicity. The difference is usually small, and either approach is acceptable.
Tipping customs vary by country. In some countries like Japan, tipping is considered rude. In the US, tipping is expected at restaurants but not at fast-food or counter-service establishments.